Run all tests in parallel

Let's see if this saves some time.

.github/workflows/validate_esphome_beta.yml

@@ -47,8 +47,6 @@ jobs:
 
   build_basic:
     name: Basic
-    needs:
-      - code_scan
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@main
@@ -60,7 +58,6 @@ jobs:
 
   build_bluetooth_proxy_4:
     name: Bluetooth Proxy (IDF)
-    needs: build_basic
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@main
@@ -72,7 +69,6 @@ jobs:
 
   build_bluetooth_proxy_53:
     name: Bluetooth Proxy (IDF v5.3)
-    needs: build_basic
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@main